Honda ACCORD HYBRID 2005 Service Manual page 861

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Clutches
The five-speed automatic transmission uses hydraulically-actuated clutches to engage or disengage the transmission
gears. W h e n hydraulic pressure is introduced into the clutch d r u m , the clutch piston moves. This presses the friction
discs and steel plates together, locking t h e m so they don't slip. Power is then transmitted t h r o u g h the engaged clutch
pack to its hub-mounted gear. Likewise, w h e n the hydraulic pressure is bled f r o m the clutch pack, the piston releases
the friction discs and the steel plates, and they are free to slide past each other. This allows the gear to spin
independently on its shaft, t r a n s m i t t i n g no power.
1st Clutch
The 1st clutch engages/disengages 1st gear, and is located at the left end of the secondary shaft. The 1st clutch is
supplied hydraulic pressure by its ATF feed pipe w i t h i n the secondary shaft.
1st-hold Clutch
The 1st-hold clutch engages/disengages 1st-hold in 1 position, and is located in the 1st clutch d r u m . The 1st-hold
clutch is supplied hydraulic pressure by its ATF feed pipe w i t h i n the secondary shaft.
2nd Clutch
The 2nd clutch engages/disengages 2nd gear, and is located at the right end of the secondary shaft. The 2nd clutch is
supplied hydraulic pressure t h r o u g h the secondary shaft by a circuit connected to the internal hydraulic circuit.
3rd Clutch
The 3rd clutch engages/disengages 3rd gear, and is located at the end of the intermediary shaft. The 3rd clutch is
supplied hydraulic pressure t h r o u g h the intermediary shaft by a circuit connected to the internal hydraulic circuit.
4th Clutch
The 4th clutch engages/disengages 4th gear, and is located at the middle of the mainshaft. The 4th clutch is joined
back-to-back to the 5th clutch. The 4th clutch is supplied hydraulic pressure t h r o u g h the mainshaft by a circuit
connected to the internal hydraulic circuit.
5th Clutch
The 5th clutch engages/disengages 5th gear, as well as reverse gear, and is located at the middle of the mainshaft. The
5th clutch is joined back-to-back to the 4th clutch. The 5th clutch is supplied hydraulic pressure t h r o u g h the mainshaft
by a circuit connected to the internal hydraulic circuit.
One-way Clutch
The one-way clutch is positioned between the 1st clutch hub and the secondary shaft 1st gear. The secondary shaft 1st
gear is splined to the 1st-hold clutch hub, w i t h the 1st-hold clutch hub splined to the secondary shaft. The secondary
shaft 1st gear provides the outer race surface, and the 1st clutch hub provides the inner race surface. The one-way
clutch locks w h e n power is transmitted f r o m the secondary shaft 1st gear to the countershaft 1st gear. The 1st clutch
and gears remain engaged in the 1st, 2nd, 3rd, 4th, and 5th gear ranges in the D, D3, 2, or 1 position.
However, the one-way clutch disengages w h e n the 2nd, 3rd, 4th, or 5th clutches and gears are applied in the D, D3, 2,
or 1 position. This is because the increased rotational speed of the gears on the secondary shaft causes the one-way
clutch to free-wheel w i t h the 1st clutch still engaged.
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